MainForm

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Windows.Forms;

namespace OOP_UI
{
    public partial class fMain : Form
    {
        //список создаваемой косметики
        public List<Cosmetics> CosmeticsList = new List<Cosmetics>()
        {
            new Mascara() { Name = "«Black Ecstasy»", AmountOfItems = 50, Price = 20,
                            Saturation = EyeProducts.Variants.Middle, LongLasting = EyeProducts.Variants.Middle,
                            Antiallergic = false, WaterProof = true, Volumizer = false, Extension = false
                          },
            new EyeShadows() { Name = "«Eyes to Kill»", AmountOfItems = 100, Price = 20,
                               Saturation = EyeProducts.Variants.Middle, LongLasting = EyeProducts.Variants.Middle,
                               Consistency = "undefined", Transparent = EyeShadows.Transparency.Middle, Glitter = false, Matte = false
                             },
            new Powder() { Name = "«Universelle Libre»", AmountOfItems = 65, Price = 20,
                           Consistency = "undefined", Matte = true, Luminous = false, Transparent = Powder.Transparency.Middle
                         },
            new Concealer() { Name = "«MAC Pro Longwear»", AmountOfItems = 70, Price = 20,
                              Consistency = "undefined", Matte = true,
                              Density = Concealer.Variants.Middle, LongLasting = Concealer.Variants.Middle, Moisturizing = false, MaskingEffect = false
                            },
            new LipPencil() { Name = "«Maybelline»", AmountOfItems = 65, Price = 20,
                              LongLasting = LipProducts.Variants.Middle, Transparent = LipProducts.Variants.Middle,
                              IsAutomatic = false, Soft = LipPencil.Softness.Medium
                            },

           new Tint() { Name = "«Relouis»", AmountOfItems = 65, Price = 20,
                        LongLasting = LipProducts.Variants.Middle, Transparent = LipProducts.Variants.Middle,
                        Taste = "undefined", Brightness = Tint.BrightnessVar.Medium,
                      },

            new Lipstick() { Name = "«NYX»", AmountOfItems = 65, Price = 20,
                             LongLasting = LipProducts.Variants.Middle, Transparent = LipProducts.Variants.Middle,
                             Density = Lipstick.Variants.Middle, HasTint = null, IsPlump = false, Shimmering = false,
                           },
        };

        //список типов каждого средства
        public List<Type> TypesList = new List<Type>()
        {
            typeof(Mascara),
            typeof(EyeShadows),
            typeof(Powder),
            typeof(Concealer),
            typeof(LipPencil),
            typeof(Tint),
            typeof(Lipstick)
        };

        public int SelectedIndex;

        public fMain()
        {
            InitializeComponent();
        }

        //загрузка формы
        private void FMain_Load(object sender, EventArgs e)
        {
            lvMainForm.MultiSelect = false;
            SelectedIndex = -1;

            foreach (var type in TypesList)
                cbTypes.Items.Add(type.ToString().Substring(7));

            cbTypes.SelectedIndex = 0;
            cbTypes.DropDownStyle = ComboBoxStyle.DropDownList;

            Redraw(lvMainForm, CosmeticsList);
        }

        //перерисовка списка
        public void Redraw(ListView listView, List<Cosmetics> items)
        {
            listView.Clear();

            for (int i = 0; i < items.Count; i++)
            {
                var LVItem = new ListViewItem();
                Type itemType = items[i].GetType();

                object Name;

                try
                {
                    var nameField = items[i].GetType().GetField("Name");
                    Name = nameField.GetValue(items[i]);
                }
                catch
                {
                    Name = "";
                }

                LVItem.Text = itemType.Name + " " + Name;
                listView.Items.Add(LVItem);
            }
        }

        //создание нового средства
        private void butCreate_Click(object sender, EventArgs e)
        {
            Cosmetics newObject = (Cosmetics) Activator.CreateInstance(TypesList[cbTypes.SelectedIndex]);
            CosmeticsList.Add(newObject);

            Form EForm = new ItemForm(newObject, CosmeticsList);
            EForm.StartPosition = FormStartPosition.CenterScreen;
            EForm.ShowDialog();
            EForm.Dispose();

            Redraw(lvMainForm, CosmeticsList);
        }

        //редактирование выбранного средства
        private void butEdit_Click(object sender, EventArgs e)
        {
            //получаем индекc выделенного пункта
            int itemNum;
            if (lvMainForm.SelectedIndices.Count != 0)
                itemNum = lvMainForm.SelectedIndices[0];
            else
                return;
            //Создаем форму редактирования обьекта
            Form EForm = new ItemForm(CosmeticsList[itemNum], CosmeticsList);
            EForm.StartPosition = FormStartPosition.CenterScreen;
            EForm.ShowDialog();
            EForm.Dispose();

            Redraw(lvMainForm, CosmeticsList);
        }

        private void Delete_Action(Cosmetics DelObject, List<Cosmetics> ObjectList)
        {
            //список объектов которые могут использовать удаляемый обьект
            var ownerList = ObjectList.Where(item => (item.GetType().GetFields().Where(field => (field.FieldType == DelObject.GetType()))).ToList().Count > 0);
            foreach (var owner in ownerList)
            {
                foreach (var field in owner.GetType().GetFields().Where(field => (field.FieldType == DelObject.GetType())).ToList())
                {
                    if (field.GetValue(owner) != null)
                    {
                        if (field.GetValue(owner).Equals(DelObject))
                        {
                            field.SetValue(owner, null);
                        }
                    }
                }
            }
            //Непосредственное удаление обьекта
            ObjectList.Remove(DelObject);
        }
        //удаление выбранного средства
        private void butDelete_Click(object sender, EventArgs e)
        {
            if ((lvMainForm.SelectedIndices.Count != 0) && (lvMainForm.SelectedIndices[0] < CosmeticsList.Count))
            {
                int itemNum = lvMainForm.SelectedIndices[0];

                Delete_Action(CosmeticsList[itemNum], CosmeticsList);
            }
            Redraw(lvMainForm, CosmeticsList);
        }
    }
}